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1. 发明专利

JPH077345A VARIABLE EQUALIZING AMPLIFIER 失效
公开(公告)号：JPH077345A
公开(公告)日：1995-01-10
申请号：JP494694
申请日：1994-01-21
申请人： NAT SEMICONDUCTOR CORP
发明人： GEERII DEII PORUHEMASU
IPC分类号： H03F3/45 , H03G3/00 , H03G3/10 , H03H11/48 , H04B3/06 , H04B3/14 , H04B3/18 , H04L25/12
摘要： PURPOSE: To obtain an adaptive equalizing circuit which equalizes a frequency response to the varying length of a transmission line by varying the ratio between an equalized signal and a nonequalized signal which are combined together for forming an equalized output signal. CONSTITUTION: An adaptive equalizing circuit 10 has a boost stage 12 which generates a completely equalized voltage signal Vfe by compensating an input voltage signal Vi with respect to frequency attenuation on the maximum length of a transmission line. A first variable gain stage 14 amplifies the completely equalized voltage signal Vfe and generates an amplified equalized voltage signal Vae in accordance with a first gain control signal Vfg. A second variable gain stage 16 amplifies the input voltage signal Vi and generates an amplified nonequalized voltage signal Vane in accordance with a second gain control signal Vsg. An addition stage 18 generates an equalized output voltage signal Vo by combining the amplified equalized voltage signal Vae and amplified nonequalized voltage signal Vane together. Therefore, a circuit which equalizes a frequency response to the varying length of the transmission line can be obtained.

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